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                <blockquote>
<p>filesystem函数允许用户访问和操作文件系统</p>
</blockquote>
<h2 id="1、复制文件-copy"><a href="#1、复制文件-copy" class="headerlink" title="1、复制文件 - copy()"></a>1、复制文件 - copy()</h2><blockquote>
<p><code>copy()</code> 函数复制文件。<br>该函数如果成功则返回 TRUE，如果失败则返回 FALSE。<br>若文件存在，则覆盖</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>copy(file,to_file)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>: 要复制的文件</li>
<li><code>to_file</code>: 复制文件的目的地</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
  <span class="token variable">$file</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'filesys.txt'</span><span class="token punctuation">;</span>
  <span class="token function">copy</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'./filesysdir/copyfile.txt'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="2、返回文件名-basename"><a href="#2、返回文件名-basename" class="headerlink" title="2、返回文件名 - basename()"></a>2、返回文件名 - basename()</h2><blockquote>
<p><code>basename()</code> 返回路径中的文件名部分。<br>若规定了扩展名，当文件有匹配的扩展名，则不显示扩展名</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>basename(path[,suffix])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>: 文件路径</li>
<li><code>suffix</code>: 文件扩展名</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
  <span class="token variable">$path</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'dir/filesys.txt'</span><span class="token punctuation">;</span>
  <span class="token function">basename</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//输出 filesys.txt</span>
  <span class="token function">basename</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'.txt'</span><span class="token punctuation">)</span> <span class="token comment">//输出 filesys</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<h2 id="3、返回文件夹部分-dirname"><a href="#3、返回文件夹部分-dirname" class="headerlink" title="3、返回文件夹部分 - dirname()"></a>3、返回文件夹部分 - dirname()</h2><blockquote>
<p><code>dirname()</code> 返回文件路径的文件夹部分。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>dirname(path)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>: 文件路径</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
  <span class="token variable">$path</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'dir/filesys.txt'</span><span class="token punctuation">;</span>
  <span class="token function">dirname</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//输出 dir</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="4、创建目录-mkdir"><a href="#4、创建目录-mkdir" class="headerlink" title="4、创建目录 - mkdir()"></a>4、创建目录 - mkdir()</h2><blockquote>
<p><code>mkdir()</code> 创建目录，成功返回true，否则false。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>mkdir(path,mode,recursive,context)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>: 要创建目录的名称</li>
<li><code>mode</code>: 规定权限。默认是 0777（允许全局访问）</li>
<li><code>recursive</code>: 规定是否设置递归模式。（PHP 5 中新增的）</li>
<li><code>context</code>: 规定文件句柄的环境。context 是一套可以修改流的行为的选项。（PHP 5 中新增的）</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token comment">// 只创建一次，先检查，如果有，则忽略，没有，则创建</span>
   <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">file_exists</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'./newDir'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
       <span class="token function">mkdir</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'./newDir'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
       <span class="token keyword">echo</span> <span class="token string single-quoted-string">'目录已存在!'</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


<h2 id="5、移动文件-move-uploaded-file"><a href="#5、移动文件-move-uploaded-file" class="headerlink" title="5、移动文件 - move_uploaded_file()"></a>5、移动文件 - move_uploaded_file()</h2><blockquote>
<p><code>move_uploaded_file()</code>移动文件到新目录。若存在，则覆盖。<br>如果成功该函数返回 TRUE，如果失败则返回 FALSE。<br><strong>注意</strong>：该函数仅用于通过 <code>HTTP POST</code> 上传的文件。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>move_uploaded_file(file,newloc)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>: 要转移的文件</li>
<li><code>newloc</code>: 文件转移的目的地</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token comment">//检查是否是通过HTTP POST上传的文件</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">is_uploaded_file</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token comment">//判断文件是否存在</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">file_exists</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'./newDir/filesys.txt'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
       <span class="token function">move_uploaded_file</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'./newDir/filesys.txt'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
       <span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件转移成功"</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
       <span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件已转移,并且存在"</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
       <span class="token keyword">echo</span> <span class="token string single-quoted-string">'文件不是通过HTTP POST 方法上传的，无法使用此方法转移！'</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="6、获取文件信息-权限-类型-大小-绝对路径"><a href="#6、获取文件信息-权限-类型-大小-绝对路径" class="headerlink" title="6、获取文件信息 - 权限_类型_大小_绝对路径"></a>6、获取文件信息 - 权限_类型_大小_绝对路径</h2><p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'文件权限：'</span><span class="token operator">.</span> <span class="token function">fileperms</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'文件类型：'</span><span class="token operator">.</span> <span class="token function">filetype</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'文件大小：'</span><span class="token operator">.</span> <span class="token function">filesize</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">1024</span> <span class="token operator">.</span> <span class="token string single-quoted-string">'kb&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'绝对路径：'</span><span class="token operator">.</span> <span class="token function">realpath</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token operator">.</span> <span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="7、获取路径信息-pathinfo"><a href="#7、获取路径信息-pathinfo" class="headerlink" title="7、获取路径信息 - pathinfo()"></a>7、获取路径信息 - pathinfo()</h2><blockquote>
<p><code>pathinfo()</code> 函数以数组的形式返回关于文件路径的信息。</p>
</blockquote>
<p>返回的数组元素如下：</p>
<ul>
<li><code>dirname</code>: 目录路径</li>
<li><code>basename</code>: 文件名</li>
<li><code>extension</code>: 文件后缀名</li>
<li><code>filename</code>: 不包含后缀的文件名</li>
</ul>
<p><strong>语法</strong></p>
<blockquote>
<p><code>pathinfo(path[,options])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>: 规定要检查的路径。</li>
<li><code>options</code>: 规定要返回的数组元素。默认是 all。</li>
</ul>
<p><strong>options可能的值</strong><br>1.<code>PATHINFO_DIRNAME</code> - 只返回 dirname<br>2.<code>PATHINFO_BASENAME</code> - 只返回 basename<br>3.<code>PATHINFO_EXTENSION</code> - 只返回 extension<br>4.<code>PATHINFO_FILENAME</code> - 只返回 filename</p>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
 <span class="token function">print_r</span><span class="token punctuation">(</span><span class="token function">pathinfo</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"/dir/filesys.txt"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>以上输出：</p>
<pre class="line-numbers language-none"><code class="language-none">Array
(
    [dirname] =&gt; /dir
    [basename] =&gt; filesys.txt
    [extension] =&gt; txt
    [filename] =&gt; filesys
)<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><strong>带参数实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
 <span class="token function">print_r</span><span class="token punctuation">(</span><span class="token function">pathinfo</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"/dir/filesys.txt"</span>，<span class="token constant">PATHINFO_BASENAME</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token comment">//输出 filesys.txt</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="8、文件操作的时间戳"><a href="#8、文件操作的时间戳" class="headerlink" title="8、文件操作的时间戳"></a>8、文件操作的时间戳</h2><p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件上次访问时间: "</span><span class="token operator">.</span><span class="token function">date</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Y-m-d H:i:s"</span><span class="token punctuation">,</span><span class="token function">fileatime</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件上次修改时间: "</span><span class="token operator">.</span><span class="token function">date</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Y-m-d H:i:s"</span><span class="token punctuation">,</span><span class="token function">filectime</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件内容上次修改时间: "</span><span class="token operator">.</span><span class="token function">date</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Y-m-d H:i:s"</span><span class="token punctuation">,</span><span class="token function">filemtime</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<blockquote>
<p>以上函数都是返回时间戳，并且执行结果会被缓存</p>
</blockquote>
<h2 id="9、获取指定磁盘总容量-disk-total-space"><a href="#9、获取指定磁盘总容量-disk-total-space" class="headerlink" title="9、获取指定磁盘总容量 - disk_total_space()"></a>9、获取指定磁盘总容量 - disk_total_space()</h2><blockquote>
<p><code>disk_total_space()</code> 函数返回指定目录的磁盘总容量，以字节为单位。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>disk_total_space(directory) </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>directory</code>：规定要检查的目录。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"> <span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
 <span class="token comment">//获取C盘的总容量 单位为G</span>
<span class="token keyword">echo</span> <span class="token function">disk_total_space</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"C:"</span><span class="token punctuation">)</span><span class="token operator">/</span> <span class="token punctuation">(</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'G'</span><span class="token punctuation">;</span>
 <span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="10、获取指定磁盘可用容量-disk-free-space"><a href="#10、获取指定磁盘可用容量-disk-free-space" class="headerlink" title="10、获取指定磁盘可用容量 - disk_free_space()"></a>10、获取指定磁盘可用容量 - disk_free_space()</h2><blockquote>
<p><code>disk_free_space()</code> 函数返回指定目录的磁盘总容量，以字节为单位。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>disk_free_space(directory) </code><br>别名：<code>diskfreespace(directory)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>directory</code>：规定要检查的目录。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"> <span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
 <span class="token comment">//获取C盘的可用容量 单位为G</span>
<span class="token keyword">echo</span> <span class="token function">disk_total_space</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"C:"</span><span class="token punctuation">)</span><span class="token operator">/</span> <span class="token punctuation">(</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token operator">*</span><span class="token number">1024</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'G'</span><span class="token punctuation">;</span>
 <span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="11、向打开文件中写入内容-fwrite"><a href="#11、向打开文件中写入内容-fwrite" class="headerlink" title="11、向打开文件中写入内容 - fwrite()"></a>11、向打开文件中写入内容 - fwrite()</h2><blockquote>
<p><code>fwrite()</code> 函数将内容写入一个<code>打开的</code>文件中。<br>函数会在到达指定长度或读到文件末尾（EOF）时（以先到者为准），停止运行。<br>如果函数成功执行，则<em>返回写入的字节数</em>。如果失败，则返回 FALSE。<br><strong>对于相同内容，每次都重新覆盖，也可以理解为只执行了一次，但实际不是</strong></p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fwrite(file,string[,length])</code><br>别名：<code>fputs(file,string[,length])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：	必需。规定要写入的打开文件。</li>
<li><code>string</code>： 必需。规定要写入打开文件的字符串。</li>
<li><code>length</code>： 	可选。规定要写入的最大字节数。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'a+'</span><span class="token punctuation">)</span> <span class="token keyword">or</span> <span class="token keyword">exit</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"打开文件失败！&lt;br&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'写入的字节数为：'</span><span class="token operator">.</span><span class="token function">fwrite</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"\nthis is new line writein with fwrite"</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<blockquote>
<p><strong>注意</strong>：内容是新增还是覆盖，取决于打开文件的模式。</p>
</blockquote>
<h2 id="12、返回读取的字符串-fread"><a href="#12、返回读取的字符串-fread" class="headerlink" title="12、返回读取的字符串 - fread()"></a>12、返回读取的字符串 - fread()</h2><blockquote>
<p><code>fread()</code> 函数读取打开的文件。<br>函数会在到达指定长度或读到文件末尾（EOF）时（以先到者为准），停止运行。<br>该函数返回读取的字符串，如果失败则返回 FALSE。<br><strong>简易理解</strong>：相当于截取操作并返回截取的字符串，再次操作就会在上次剩余的里面截取</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fread(file,length) </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要读取的打开文件。</li>
<li><code>length</code>：必需。规定要读取的最大字节数。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'a+'</span><span class="token punctuation">)</span> <span class="token keyword">or</span> <span class="token keyword">exit</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"打开文件失败！&lt;br&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 复习：使用filesize()函数获取文件大小（文件全部字节长度）</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"读取文件全部内容："</span><span class="token operator">.</span><span class="token function">fread</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">,</span><span class="token function">filesize</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// echo "读取文件20个字节：".fread($file,20);</span>
<span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span><span class="token operator">--</span>
<span class="token comment">// 若是两个输出同时开启，那么下面的输出为0,因为上面的读取了所有字节，没有剩余</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="13、将文件读入一个数组-file"><a href="#13、将文件读入一个数组-file" class="headerlink" title="13、将文件读入一个数组 - file()"></a>13、将文件读入一个数组 - file()</h2><blockquote>
<p><code>file()</code> 函数把整个文件读入一个数组中。<br>数组中的每个元素都是文件中相应的一行，包括换行符在内。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>file(path[,include_path][,context])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>：必需。 规定要读取的文件。</li>
<li><code>include_path</code>： 可选参数。可以是以下一个或多个常量。</li>
<li><code>context</code>： 可选。规定文件句柄的环境。</li>
</ul>
<p><strong>可选参数</strong><br>1.<code>FILE_USE_INCLUDE_PATH</code> - 在 include_path 中查找文件。<br>2.<code>FILE_IGNORE_NEW_LINES</code> - 在数组每个元素的末尾不要添加换行符。<br>3.<code>FILE_SKIP_EMPTY_LINES</code> - 跳过空行。</p>
<h2 id="14、裁剪文件-ftruncate"><a href="#14、裁剪文件-ftruncate" class="headerlink" title="14、裁剪文件 - ftruncate()"></a>14、裁剪文件 - ftruncate()</h2><blockquote>
<p><code>ftruncate()</code> 函数把打开的文件裁剪到指定的长度然后保存。<br>如果成功则返回 TRUE，如果失败则返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>ftruncate(file,size) </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要截断的打开文件。</li>
<li><code>size</code>：必需。规定新的文件大小。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token keyword">echo</span> <span class="token string single-quoted-string">'文件原始大小：'</span><span class="token operator">.</span><span class="token function">filesize</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'a+'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">ftruncate</span><span class="token punctuation">(</span><span class="token variable">$file16</span><span class="token punctuation">,</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//清除缓存</span>
<span class="token function">clearstatcache</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'截取后的大小：'</span><span class="token operator">.</span><span class="token function">filesize</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="15、文件指针操作"><a href="#15、文件指针操作" class="headerlink" title="15、文件指针操作"></a>15、文件指针操作</h2><p><strong>综合实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'r'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// ftell()返回当前指针位置</span>
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'初始指针位置：'</span><span class="token operator">.</span><span class="token function">ftell</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token comment">// fseek(file,offset) 移动指针</span>
<span class="token function">fseek</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"15"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'移动后指针位置：'</span><span class="token operator">.</span><span class="token function">ftell</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token comment">// rewind(file) 倒回指针到文件开头</span>
<span class="token function">rewind</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token keyword">echo</span> <span class="token string single-quoted-string">'倒回后指针位置：'</span><span class="token operator">.</span><span class="token function">ftell</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string single-quoted-string">'&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><strong>以上操作返回</strong></p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html">初始指针位置：0
移动后指针位置：15
倒回后指针位置：0<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<p>###15.1、返回指针当前位置 - ftell()</p>
<blockquote>
<p><code>ftell()</code> 函数返回在打开文件中的当前位置。<br>返回文件指针的当前位置，如果失败则返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>ftell(file) </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要检查的已打开文件。</li>
</ul>
<p>###15.2、指针移动 - fseek()</p>
<blockquote>
<p><code>fseek()</code> 函数在打开的文件中定位。<br>该函数把文件指针从当前位置向前或向后移动到新的位置，新位置从<strong>文件头开始以字节数度量</strong>。<br>如果成功该函数返回 0，如果失败则返回 -1。请注意，移动到文件末尾（EOF）之后的位置不会产生错误。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fseek(file,offset,whence)  </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要检查的已打开文件。</li>
<li><code>offset</code>：必需。规定新的位置（从文件头开始以字节数度量）。</li>
<li><code>whence</code>： 可选。（PHP 4 中新增的）。</li>
</ul>
<p><strong>whence可能的值</strong><br>1.<code>SEEK_SET</code> - 设定位置等于 offset。默认。<br>2.<code>SEEK_CUR</code> - 设定位置为当前位置加上 offset。<br>3.<code>SEEK_END</code> - 设定位置为文件末尾（EOF）加上 offset（要移动到文件末尾之前的位置，offset 必须是一个负值）。</p>
<p>###15.3、指针重置 - rewind()</p>
<blockquote>
<p><code>rewind()</code> 函数将文件指针的位置倒回文件的开头。<br>如果成功，该函数返回 TRUE。如果失败，则返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>rewind(file) </code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定已打开的文件。</li>
</ul>
<h2 id="16、重命名-rename"><a href="#16、重命名-rename" class="headerlink" title="16、重命名 - rename()"></a>16、重命名 - rename()</h2><blockquote>
<p><code>rename()</code> 函数重命名文件或目录。<br>如果成功，该函数返回 TRUE。如果失败，则返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>rename(oldname,newname[,context])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>oldname</code>：必需。规定要重命名的文件或目录。</li>
<li><code>newname</code>：必需。规定文件或目录的新名称。</li>
<li><code>context</code>：可选。规定文件句柄的环境。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$oldName</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'oldDir'</span><span class="token punctuation">;</span>
<span class="token variable">$newName</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'renameDir'</span><span class="token punctuation">;</span>
<span class="token comment">// 先检查老文件名是否存在</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">file_exists</span><span class="token punctuation">(</span><span class="token variable">$oldName</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token variable">$renameRes</span> <span class="token operator">=</span> @<span class="token function">rename</span><span class="token punctuation">(</span><span class="token variable">$oldName</span><span class="token punctuation">,</span><span class="token variable">$newName</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//检查是否重命名成功</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token variable">$renameRes</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">echo</span>  <span class="token string double-quoted-string">"重命名成功！"</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
      <span class="token comment">// 检查新名字是否存在</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">file_exists</span><span class="token punctuation">(</span><span class="token variable">$newName</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
           <span class="token keyword">echo</span> <span class="token variable">$newName</span><span class="token operator">.</span><span class="token string double-quoted-string">"已存在，无法重复命名"</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
            <span class="token keyword">echo</span> <span class="token string double-quoted-string">"重命名失败，请检查后再试"</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
       <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token keyword">echo</span> <span class="token variable">$oldName</span><span class="token operator">.</span><span class="token string single-quoted-string">'不存在&lt;br&gt;'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="17、将文件读入字符串-file-get-contents"><a href="#17、将文件读入字符串-file-get-contents" class="headerlink" title="17、将文件读入字符串 - file_get_contents()"></a>17、将文件读入字符串 - file_get_contents()</h2><blockquote>
<p><code>file_get_contents()</code> 把整个文件读入一个字符串中。<br>该函数是用于把文件的内容读入到一个字符串中的<strong>首选方法</strong>。<br>如果服务器操作系统支持，还会使用内存映射技术来增强性能。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>file_get_contents(path[,include_path][,context][,start][,max_length])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>path</code>： 必需。规定要读取的文件，或者url。</li>
<li><code>include_path</code>： 可选。如果您还想在 include_path（在 php.ini 中）中搜索文件的话，请设置该参数为 ‘1’。</li>
<li><code>context</code>：可选。规定文件句柄的环境。</li>
<li><code>start</code>： 可选。规定在文件中开始读取的位置。 PHP 5.1 中新增。</li>
<li><code>max_length</code>： 可选。规定读取的字节数。 PHP 5.1 中新增。</li>
</ul>
<p><strong>实例</strong></p>
<p>假定<code>test.txt</code>中的内容为：<code>this is a test file</code></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token keyword">echo</span> <span class="token function">file_get_contents</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.txt"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 输出 this is a test file</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="✔-file-get-contents函数超时处理"><a href="#✔-file-get-contents函数超时处理" class="headerlink" title="✔ file_get_contents函数超时处理"></a>✔ file_get_contents函数超时处理</h2><blockquote>
<p>在使用<code>file_get_contents</code>函数读取文件或URL的时候，经常会出现超时的情况，我们可以通过一些方法来尽量的避免或者解决。</p>
</blockquote>
<h3 id="1、增加超时的时间限制"><a href="#1、增加超时的时间限制" class="headerlink" title="1、增加超时的时间限制"></a>1、增加超时的时间限制</h3><p>这里需要注意：<code>set_time_limit(0)</code>只是设置你的PHP程序的超时时间，而不是<code>file_get_contents</code>函数读取URL的超时时间。 </p>
<p>想通过<code>set_time_limit(0)</code>影响到<code>file_get_contents</code>来增加超时时间，经测试，是无效的。</p>
<p>真正的修改<code>file_get_contents</code>延时可以用<code>resource $context</code>的<code>timeout</code>参数，<code>timeout</code>参数的单位是<code>s</code>（秒）。 </p>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$opts</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span> 
    <span class="token string single-quoted-string">'http'</span><span class="token operator">=&gt;</span><span class="token keyword">array</span><span class="token punctuation">(</span> 
        <span class="token string single-quoted-string">'method'</span><span class="token operator">=&gt;</span><span class="token string double-quoted-string">"GET"</span><span class="token punctuation">,</span> 
        <span class="token string single-quoted-string">'timeout'</span><span class="token operator">=&gt;</span><span class="token number">30</span><span class="token punctuation">,</span> 
    <span class="token punctuation">)</span> 
<span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token variable">$html</span> <span class="token operator">=</span> <span class="token function">file_get_contents</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'http://www.abc.com'</span><span class="token punctuation">,</span> <span class="token constant boolean">false</span><span class="token punctuation">,</span> <span class="token function">stream_context_create</span><span class="token punctuation">(</span><span class="token variable">$opts</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、超过几秒就重新执行，多次重试直到成功"><a href="#2、超过几秒就重新执行，多次重试直到成功" class="headerlink" title="2、超过几秒就重新执行，多次重试直到成功"></a>2、超过几秒就重新执行，多次重试直到成功</h3><p><code>file_get_contents</code>超时有时候失败是因为网络等因素造成，没有解决办法，但是可以修改程序，失败时重试几次，仍然失败就放弃，因为<code>file_get_contents()</code>如果失败将返回 FALSE，所以可以下面这样编写代码：</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$cnt</span><span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span> 
<span class="token comment">// 重载三次，再失败就放弃</span>
<span class="token keyword">while</span><span class="token punctuation">(</span><span class="token variable">$cnt</span> <span class="token operator">&lt;</span> <span class="token number">3</span> <span class="token operator">&amp;&amp;</span> <span class="token punctuation">(</span><span class="token variable">$str</span><span class="token operator">=</span>@<span class="token function">file_get_contents</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'http://www.abc.com'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">===</span><span class="token constant boolean">FALSE</span><span class="token punctuation">)</span> <span class="token variable">$cnt</span><span class="token operator">++</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<blockquote>
<p>注意：如果执行时间过长，还需要用函数<code>set_time_limit(0)</code>就不会超时了。</p>
</blockquote>
<h2 id="✔-file-get-contents函数代理设置处理"><a href="#✔-file-get-contents函数代理设置处理" class="headerlink" title="✔ file_get_contents函数代理设置处理"></a>✔ file_get_contents函数代理设置处理</h2><h3 id="设置代理IP去获取页面数据"><a href="#设置代理IP去获取页面数据" class="headerlink" title="设置代理IP去获取页面数据"></a>设置代理IP去获取页面数据</h3><pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$context</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span> 
    <span class="token string single-quoted-string">'http'</span> <span class="token operator">=&gt;</span> <span class="token keyword">array</span><span class="token punctuation">(</span> 
      <span class="token comment">//这里设置你要使用的代理ip及端口号 </span>
        <span class="token string single-quoted-string">'proxy'</span> <span class="token operator">=&gt;</span> <span class="token string single-quoted-string">'tcp://192.168.0.1:3128'</span><span class="token punctuation">,</span>  
        <span class="token string single-quoted-string">'request_fulluri'</span> <span class="token operator">=&gt;</span> <span class="token constant boolean">true</span><span class="token punctuation">,</span> 
    <span class="token punctuation">)</span><span class="token punctuation">,</span> 
<span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token variable">$context</span> <span class="token operator">=</span> <span class="token function">stream_context_create</span><span class="token punctuation">(</span><span class="token variable">$context</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token variable">$html</span> <span class="token operator">=</span> <span class="token function">file_get_contents</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"http://www.abc.com"</span><span class="token punctuation">,</span> <span class="token constant boolean">false</span><span class="token punctuation">,</span> <span class="token variable">$context</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token keyword">echo</span> <span class="token variable">$html</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="设置需要验证的代理IP去采集获取页面数据"><a href="#设置需要验证的代理IP去采集获取页面数据" class="headerlink" title="设置需要验证的代理IP去采集获取页面数据"></a>设置需要验证的代理IP去采集获取页面数据</h3><pre class="line-numbers language-php" data-language="php"><code class="language-php"> <span class="token comment">//LOGIN:PASSWORD 这里是代理服务器的账户名及密码 </span>
<span class="token variable">$auth</span> <span class="token operator">=</span> <span class="token function">base64_encode</span><span class="token punctuation">(</span><span class="token string single-quoted-string">'USER:PASS'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  
<span class="token variable">$context</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span> 
    <span class="token string single-quoted-string">'http'</span> <span class="token operator">=&gt;</span> <span class="token keyword">array</span><span class="token punctuation">(</span> 
      <span class="token comment">//这里设置你要使用的代理ip及端口号 </span>
        <span class="token string single-quoted-string">'proxy'</span> <span class="token operator">=&gt;</span> <span class="token string single-quoted-string">'tcp://192.168.0.1:3128'</span><span class="token punctuation">,</span>  
        <span class="token string single-quoted-string">'request_fulluri'</span> <span class="token operator">=&gt;</span> <span class="token constant boolean">true</span><span class="token punctuation">,</span> 
        <span class="token string single-quoted-string">'header'</span> <span class="token operator">=&gt;</span> <span class="token string double-quoted-string">"Proxy-Authorization: Basic <span class="token interpolation"><span class="token variable">$auth</span></span>"</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">,</span> 
<span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token variable">$context</span> <span class="token operator">=</span> <span class="token function">stream_context_create</span><span class="token punctuation">(</span><span class="token variable">$context</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token variable">$html</span> <span class="token operator">=</span> <span class="token function">file_get_contents</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"http://www.abc.com"</span><span class="token punctuation">,</span> <span class="token constant boolean">false</span><span class="token punctuation">,</span> <span class="token variable">$context</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token keyword">echo</span> <span class="token variable">$html</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="18、将字符串写入文件-file-put-contents"><a href="#18、将字符串写入文件-file-put-contents" class="headerlink" title="18、将字符串写入文件 - file_put_contents()"></a>18、将字符串写入文件 - file_put_contents()</h2><blockquote>
<p><code>file_put_contents()</code> 函数把一个字符串写入文件中。<br>执行一次，写入一次<br>如果成功，该函数将返回写入文件中的字符数。如果失败，则返回 False。</p>
</blockquote>
<p><strong>该函数访问文件时，遵循以下规则：</strong></p>
<ol>
<li>如果设置了 <code>FILE_USE_INCLUDE_PATH</code>，那么将检查 <code>filename</code> 副本的内置路径</li>
<li>如果文件不存在，将创建一个文件</li>
<li>打开文件</li>
<li>如果设置了 <code>LOCK_EX</code>，那么将锁定文件</li>
<li>如果设置了 <code>FILE_APPEND</code>，那么将移至文件末尾。否则，将会清除文件的内容</li>
<li>向文件中写入数据</li>
<li>关闭文件并对所有文件解锁</li>
</ol>
<p><strong>语法</strong></p>
<blockquote>
<p><code> file_put_contents(file,data[,mode][,context])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要写入数据的文件。如果文件不存在，则创建一个新文件。</li>
<li><code>data</code>：必需。规定要写入文件的数据。可以是字符串、数组或数据流。</li>
<li><code>mode</code>：可选。规定如何打开/写入文件。</li>
<li><code>context</code>：可选。规定文件句柄的环境。</li>
</ul>
<p><strong>mode可能的值：</strong><br>1.<code>FILE_USE_INCLUDE_PATH</code><br>2.<code>FILE_APPEND</code><br>3.<code>LOCK_EX</code></p>
<blockquote>
<p>注意：默认是请空文件内容，然后添加。如果是向其中追加内容，请添加 <code>FILE_APPEND</code> 标记，避免删除文件中已存在的内容</p>
</blockquote>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token comment">// 1.请空原文件内容，添加，返回添加字符数</span>
<span class="token keyword">echo</span> <span class="token function">file_put_contents</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'add a new line'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token comment">// 2.文末追加</span>
<span class="token function">file_put_contents</span><span class="token punctuation">(</span><span class="token variable">$path</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"add a new line"</span><span class="token punctuation">,</span> <span class="token constant">FILE_APPEND</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="19、fgets-、fgetc-和fgetss"><a href="#19、fgets-、fgetc-和fgetss" class="headerlink" title="19、fgets()、fgetc()和fgetss()"></a>19、fgets()、fgetc()和fgetss()</h2><p>假定<code>test.txt</code>中的内容如下：</p>
<pre class="line-numbers language-txt" data-language="txt"><code class="language-txt">hello,this is the first line
the 2nd line
the 3rd line<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<p>假定<code>test.htm</code>中的内容如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>i</span><span class="token punctuation">&gt;</span></span>hello,this is the first line<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>i</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>i</span><span class="token punctuation">&gt;</span></span>the 2nd line<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>i</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>i</span><span class="token punctuation">&gt;</span></span>the 3rd line<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>i</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>


<h3 id="1、fgets-按行读取"><a href="#1、fgets-按行读取" class="headerlink" title="1、fgets() - 按行读取"></a>1、fgets() - 按行读取</h3><blockquote>
<p><code>fgets()</code> 函数从打开的文件中返回一行。<br><code>fgets()</code> 函数会在到达指定长度或读到文件末尾（EOF）时（以先到者为准），停止返回一个新行。<br>如果失败该函数返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fgets(file[,length])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要读取的文件。</li>
<li><code>length</code>：可选。规定要读取的字节数。默认是 1024 字节。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
  <span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.txt"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">echo</span> <span class="token function">fgets</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>输出如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html">hello,this is the first line<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>如果想要输出整个文件：</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
  <span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.txt"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token comment">// 判断是否到达了文件末尾</span>
  <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token operator">!</span> <span class="token function">feof</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
  <span class="token keyword">echo</span> <span class="token function">fgets</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token operator">.</span> <span class="token string double-quoted-string">"&lt;br /&gt;"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
  <span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>输出如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html">hello,this is the first line
the 2nd line
the 3rd line<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>


<h3 id="2、fgetc-按字符读取"><a href="#2、fgetc-按字符读取" class="headerlink" title="2、fgetc() -  按字符读取"></a>2、fgetc() -  按字符读取</h3><blockquote>
<p><code>fgetc()</code> 函数从打开的文件中返回一个单一的字符。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fgetc(file)</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要检查的文件。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.txt"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">fgetc</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>输出：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html">h<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>若需要读取整个文件，方法同<code>fgets()</code></p>
<blockquote>
<p>注意：该函数处理大文件非常缓慢，所以它不用于处理大文件。<br>如果您需要从一个大文件依次读取一个字符，请使用 <code>fgets()</code> 依次读取一行数据，然后使用 <code>fgetc()</code> 依次处理行数据。</p>
</blockquote>
<h3 id="3、fgetss-按行读取并过滤HTML和PHP标签"><a href="#3、fgetss-按行读取并过滤HTML和PHP标签" class="headerlink" title="3、fgetss() - 按行读取并过滤HTML和PHP标签"></a>3、fgetss() - 按行读取并过滤HTML和PHP标签</h3><blockquote>
<p><code>fgetss()</code> 函数从打开的文件中返回一行，并过滤掉 HTML 和 PHP 标签。<br><code>fgetss()</code> 函数会在到达指定长度或读到文件末尾（EOF）时（以先到者为准），停止返回一个新行。<br>如果失败该函数返回 FALSE。<br>不推荐使用。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>fgetss(file[,length][,tags])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>file</code>：必需。规定要检查的文件。</li>
<li><code>length</code>：可选。规定要读取的字节数。默认是 1024 字节。（php5之前为必需参数）</li>
<li><code>tags</code>：可选。指定不会被删除的标签。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.htm"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">fgetss</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>输出如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html">hello,this is the first line<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>若不想过滤某个（些）标签，可以添加第二参数：</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token variable">$file</span> <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"test.htm"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">fgetss</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">,</span><span class="token number">1024</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"&lt;p&gt;,&lt;i&gt;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?&gt;</span></span> <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>输出如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>i</span><span class="token punctuation">&gt;</span></span>hello,this is the first line<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>i</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h2 id="20、删除文件-unlink"><a href="#20、删除文件-unlink" class="headerlink" title="20、删除文件 - unlink()"></a>20、删除文件 - unlink()</h2><blockquote>
<p><code>unlink()</code> 函数删除文件。<br>如果成功，该函数返回 TRUE。如果失败，则返回 FALSE。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>unlink(filename[,context])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>filename</code>：必需。规定要删除的文件。</li>
<li><code>context</code>：可选。规定文件句柄的环境。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$unlink</span> <span class="token operator">=</span> <span class="token function">unlink</span><span class="token punctuation">(</span><span class="token variable">$file</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token variable">$unlink</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件删除成功"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token keyword">echo</span> <span class="token string double-quoted-string">"文件删除失败！"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="21、删除空文件夹-rmdir"><a href="#21、删除空文件夹-rmdir" class="headerlink" title="21、删除空文件夹 - rmdir()"></a>21、删除空文件夹 - rmdir()</h2><blockquote>
<p><code>rmdir()</code> 尝试删除 <code>dirname</code> 所指定的目录。 该目录必须是空的，而且要有相应的权限。</p>
</blockquote>
<p><strong>语法</strong></p>
<blockquote>
<p><code>rmdir(dir[,context])</code></p>
</blockquote>
<p><strong>参数说明</strong></p>
<ul>
<li><code>dir</code>：必需。规定要删除的目录。</li>
<li><code>context</code>：可选。规定文件句柄的环境。</li>
</ul>
<p><strong>实例</strong></p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token variable">$emptyDir</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'filesysdir'</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span>@<span class="token function">rmdir</span><span class="token punctuation">(</span><span class="token variable">$emptyDir</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">echo</span> <span class="token string double-quoted-string">"空文件夹"</span><span class="token operator">.</span><span class="token variable">$emptyDir</span><span class="token operator">.</span><span class="token string double-quoted-string">"已删除"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
    <span class="token keyword">echo</span> <span class="token variable">$emptyDir</span><span class="token operator">.</span><span class="token string single-quoted-string">'不是空文件夹，如需删除，请手动删除！'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="22、清除文件状态缓存-clearstatcache"><a href="#22、清除文件状态缓存-clearstatcache" class="headerlink" title="22、清除文件状态缓存 - clearstatcache()"></a>22、清除文件状态缓存 - clearstatcache()</h2><blockquote>
<p>clearstatcache() 函数清除文件状态缓存。</p>
</blockquote>
<p>PHP 会缓存某些函数的返回信息，以便提供更高的性能。但是有时候，比如在一个脚本中多次检查同一个文件，而该文件在此脚本执行期间有被删除或修改的危险时，你需要清除文件状态缓存，以便获得正确的结果。要做到这一点，请使用 <code>clearstatcache()</code> 函数。</p>
<p><strong>语法</strong></p>
<blockquote>
<p><code>clearstatcache()</code></p>
</blockquote>
<p><strong>会进行缓存的函数，即受 clearstatcache() 函数影响的函数:</strong></p>
<ul>
<li><code>stat()</code></li>
<li><code>lstat()</code></li>
<li><code>file_exists()</code></li>
<li><code>is_writable()</code></li>
<li><code>is_readable()</code></li>
<li><code>is_executable()</code></li>
<li><code>is_file()</code></li>
<li><code>is_dir()</code></li>
<li><code>is_link()</code></li>
<li><code>filectime()</code></li>
<li><code>fileatime()</code></li>
<li><code>filemtime()</code></li>
<li><code>fileinode()</code></li>
<li><code>filegroup()</code></li>
<li><code>fileowner()</code></li>
<li><code>filesize()</code></li>
<li><code>filetype()</code></li>
<li><code>fileperms()</code></li>
</ul>
<h2 id="附：几个判断"><a href="#附：几个判断" class="headerlink" title="附：几个判断"></a>附：几个判断</h2><table>
<thead>
<tr>
<th>函数</th>
<th>语义</th>
</tr>
</thead>
<tbody><tr>
<td><code>is_dir(file)</code></td>
<td>目录 ？</td>
</tr>
<tr>
<td><code>is_executable(file)</code></td>
<td>可执行文件 ？</td>
</tr>
<tr>
<td><code>is_file(file)</code></td>
<td>常规文件 ？</td>
</tr>
<tr>
<td><code>is_link(file)</code></td>
<td>一个连接 ？</td>
</tr>
<tr>
<td><code>is_readable(file)</code></td>
<td>可读 ？</td>
</tr>
<tr>
<td><code>is_uploaded_file(file)</code></td>
<td>通过 <code>HTTP POST</code> 上传的 ？</td>
</tr>
<tr>
<td><code>is_writable(file)</code></td>
<td>可写 ？</td>
</tr>
<tr>
<td><code>is_writeable(file)</code></td>
<td><code>is_writable</code>的别名</td>
</tr>
</tbody></table>

                
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                        title: $("title", this).text(),
                        content: $("content", this).text(),
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                    };
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                        var index_title = -1;
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                });
            }
        });
    };

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});
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